Combing machine with reciprocating feed grid for wool, cotton, and the like



April 8, 1941.

K. J. scHMn-T 2.237.714 COMBING MAC E WITH RECIPROCA G FEEL GRID FOR L,COTTON, AND T LIKE Filed Feb. 11. 1938 Patented Apr. 8, 1941 COMBINGMACHINE WITH RECIPROC'ATING FEED GRID FOR WOOL, COTTON, AND THE LIKEEarl Josef Sohmitt, Chemnitz, Germany, assignor to SachsischeTextilmaschinenfabrik vorm. Rich. Hartmann Aktiengesellschaft, Chemnitz,

Germany Application February 11, 1938, Serial 189,994 In Germany March8, 193'? 1 Claim.

This invention relates to a combing machine with a reciprocating feedinggrate for wool, cotton, silk, hemp, flax and the like. The object of theinvention is to obtain an alteration in the amplitude of the relativemovement of the feeding grate occurring at the closing of the nipper, inorder to make it possible to increase the length of the fibre tuft to becombed.

It has become known, to mount on the driving shaft, which carries thecam disc for carrying out the feeding movement and the counter movement,a second cam disc by which to the grate, the holder comb and the feedingcomb a backward movement adapted to be regulated is imparted just beforeor directly after the breaking of the fibre tuft. The object is toregulate the quantity of this tuft and the cleanness of the combmovement. This arrangement is complicated as it requires a second camdisc, a second double lever and so forth, whereby it is rendereddifficult to survey the operative elements.

In another known construction, which serves to alter the pitch, whichmeans to alter the length of the fibre tuft to be combed, an additionalforward movement is imparted to the feeding grate and is suppressedafter the combing or prior to the drawing off of the fibre tuft. Withthis object in view a second cam disk and a second lever are necessary,besides the cam disc for the feeding movement by which additionalmovement adapted to be regulated is imparted.

The invention has for its object to avoid the additional elements, whichimpair the observation and render difficult the attendance. With thisobject in view the relative movement of the feeding grate connected withthe nipper is, accordin to the invention, made alterable thereby thatthe cam disc controlling the feeding and the counterfeeding movement ofthe grate by means of a lever is constructed so that the lever isliberated from the cam disc after the feeding movement and the feedinggrate is pushed forward by means of a spring or similar element prior orduring the closing of the nipper, the amplitude of this forward movementbeing adapted to be regulated by an adjustable stop. The regulation ofthe movement of the feeding grate is therefore independent of the meansfor moving the same.

Two embodiments of the invention are illustrated, by way of example, inthe accompanying drawing, in which:

Fig. 1 shows the device in side elevation, the detaching of the fibretuft being completed.

Fig. 2 is a similar view on a larger scale showing part of a modifiedform of construction.

The detaching device comprises, for example, two detaching cylinders 12and an endless band a guided on the lower detaching cylinder. The nipperis designated by c, r, the feed grid by d and the cam disc for thereciprocation of the feed grid by e. The cam disc e actuates the feedgrid by means of a bell-crank lever 1 which bears with a roller g on thedownwardly directed arm of a two-armed lever h, the other arm of whichis movably connected with the feed grid d. The roller g is adjustablymounted for varying the extent of the feeding movement. The twoarmedlever it is pivotally mounted on a shaft 17 of the nipper, that is, iscoaxial therewith so that during the opening and closing of the nipperthe feed grid slides as far as possible. The twoarmed lever 11. is underthe influence of a tension spring k in such a manner that its downwardlydirected arm bears tightly against the roller g in the bell-crank leverf. Consequently the bellcrank lever f has a tendency to press its roller111. against the cam disc e. The lower nipper bar 1' is loosely mountedon the shaft i and pressed by a spring against a feed grid d whoseupward movement is limited by a stop not shown on the drawing. The grid(1 is oscillatably mounted on the lever h at a distance from the shaft12 and bears against the bar 1' by gravity. Whenthe lower bar 1" isdepressed periodically against the action of the spring in the usualmanner by the descending and ascending nipper bar 0, and as the lowernipper bar T swings up and down, the grid at slides towards and awayfrom the extremity of the bar 1'.

During the closing of the nipper (see dotted position in Fig. 1) thefeed grid slides rearwardly on the lower nipper bar. The extent of thismovement is dependent upon the length of path of the nipping point ofthe nipper from the drawing off position to the combing position. Thismovement is adjustable by a stationary set screw n in order to reduce orincrease Within predetermined limits the length of the fibre tuftpresented by the nipper c. The relative movement of the feed grid isreduced and consequently that of the fibre tuft to be combed isincreased by loosening the screw n. So that the roller m of thebell-crank lever f has sufficient clearance to attain the limitingposition of the bell-crank lever, the cam disc c has a recess ordepression s.

Fig. 1 shows the arrangement in the position at the end of the feedingmovement which is normally followed by the additional movement. Thisadditional movement is eliminated when the set screw 11. is screwedforward so far that the roller m of the lever 1 cannot drop into thedepression .9 when the roller m leaves the race of the cam disccorresponding to the feeding movement.

To impart an additional movement to the feed grid d at the end of thefeeding movement the set screw n is screwed back a distancecorresponding to the extent of the additional movement. In this positionthe roller m of the bellcrank lever f can drop into the depression s inthe cam disc e at the end of the feeding movement, resulting in theadditional movement of the feed grid.

At the end of the additional forward movement of the feed grid this isswung upwards for the purpose of carrying out the counter feeding. Thenipper c, r is then in its lower position in which the combing iscarried out. Shortly before the end of the counter feed the combing isalso finished, whereupon the nipper with the feeding device returns intoits upper position. At the same time the nipper opens and again shiftsthe feed grid forward, that is towards the nipping point of the nipper.

In the form of construction illustrated in Fig. 2 the set screw n is onthe lower arm of the bell crank lever f. In this instance it influencesa lever o loosely mounted on the same axle as the bell crank lever andwhich carries a roller p hearing against a disc q arranged beside thecam disc e. This disc q projects beyond the periphery of the recessedportion of the cam disc e. The movement of the lever ,f is thereforelimited in that the position of the lever o is altered by tightening orloosening the screw n.

I claim:

In a feeding device for Hellman type combing machines, a nippercomprising an upper nipper bar and a lower nipper bar, a feed gridmovable relatively to said lower nipper bar, means for varying therelative movement between said lower nipper bar and said grid, saidmeans including a cam mechanism having a cam and a cooperating elementfor imparting a movement to said feed grid relative to said nipper bar,an adjustable stop cooperating with said cam mechanism to determine suchrelative movement, the cam in said cam mechanism having a cut awayportion with the wall of the cut-away portion spaced from the element ofthe cam mechanism directly associated with the cam during a rotaryposition of the cam to increase the gap between the feed grid and end ofthe lower bar before and during the closing of the nipper.

KARL JOSEF SCHMITI.

